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  3. March 2006

Re: rDNS?

We had the exact same issue with Comcast.  No change was done on our i5. 
It had something to do with NAT or Network Address Translation. Apparently 
when you send email from your i5 and it goes through your router it will 
get NATed from an internal address (sample 10.10.1.12) to an external 
address.  That address may be any one of a series that it picks from a 
pool.  For example anything in the range of 208.202.42.1 through 
208.202.42.20.  Now, when this address gets to Comcast and they try to do 
a rDNS lookup it may fail.  I forget what our router guy did.  But it 
might have had something to do with either making sure that the rDNS 
worked for all, or, that every time the i5 goes through the router it 
picks the same address.

Rob Berendt

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